In this question we checked weather pre-k is available or not but we didnt check that no is previously avaialble or not so we are storing the first occurency

#1

in this question we checked weather pre-k is available or not but we didnt check that no is previously avaialble or not so we are storing the first occurency

#3

we need to check for both in our map. then only we will be able to generate longest subarray.

ie if we have seen pre first time then only add it to map.

#4

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